PROBLEM TO BE SOLVED: To provide a disposable diaper capable of suppressing rough skin in a portion where an exterior member comes into contact for a long period of time. SOLUTION: A disposable diaper has an exterior member and an absorbent main body arranged on the skin surface side of the exterior member, and the exterior member is formed from a front abdomen, a back back, and a crotch located between them. The exterior member is provided with a fumaric acid adhering region at least a part of a skin contact portion that comes into direct contact with the wearer's skin, and the skin contact portion is made of a cloth or a plastic film. The acid adhering region is characterized in that fumaric acid is directly adhering to the cloth or plastic film. [Selection diagram] Fig. 1【課題】外装部材が接触する部分における肌あれを、長期間にわたって抑制できる使い捨ておむつを提供する。【解決手段】使い捨ておむつは、外装部材と前記外装部材の肌面側に配置された吸収性本体とを有し、前記外装部材は前腹部と後背部とこれらの間に位置する股部とから構成され、前記外装部材は着用者の肌に直接接触する肌接触部の少なくとも一部にフマル酸付着領域が設けられており、前記肌接触部は布またはプラスチックフィルムから構成されており、前記フマル酸付着領域は前記布またはプラスチックフィルムにフマル酸が直接付着していることを特徴とする。【選択図】図１
